What is a common red flag when inspecting HVAC systems?

Insufficient airflow or noticeable unusual sounds during operation are significant red flags when inspecting HVAC systems because they can indicate underlying issues that may compromise the system's efficiency and functionality. Proper airflow is essential for the effective heating or cooling of a space; any reduction could suggest problems such as blockages in the ductwork, malfunctioning fans, or even issues with the compressor. Unusual sounds, such as banging, hissing, or constant rattling, can point to mechanical failures or loose components that may need urgent attention.

In contrast, high efficiency ratings are typically a positive feature of HVAC systems, indicating that they operate effectively and help save energy costs. Newly installed parts might suggest that updates or repairs have been made, which is not inherently a red flag unless aligned with other issues. Regular maintenance records are usually a sign of a well-cared-for system and do not indicate problems on their own. Thus, noticing insufficient airflow or sounds is critical for assessing the HVAC system's condition and ensuring it functions properly.